MathDB
erasing digits from 188188...188, largest multiple of 7

Source: Tuymaada 2000 Juniors 1

April 28, 2019
number theoryDigitsmultiplemaximum

Problem Statement

Given the number 188188...188188188...188 (number 188188 is written 101101 times). Some digits of this number are crossed out. What is the largest multiple of 77, that could happen?
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